Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
  • B62D25/08—Front or rear portions

Definitions

• the invention relates to a side member for a rear frame structure of the vehicle. It also relates to a vehicle chassis rear structure equipped with two longitudinal members, and a vehicle comprising such a rear structure.
• the longitudinal members of a rear frame structure of a vehicle are well known to stiffen the chassis structure and ensure the connection including the rear suspension to the chassis.
• these side rails intended to be connected to the bumper beam of the vehicle, are designed to deform in case of sudden shock, so as to absorb the kinetic energy of the shock.
• These struts are obtained by stamping processes, which do not allow the use of materials with very high shades. This results in obtaining heavy parts, complex shapes, often difficult to install on the rear frame structure.
• the structure of the vehicle must be adapted each time to ensure the feasibility of the vehicle, then the side rails must, for each type of vehicle, be the object of a specific development so that their length is adapted to the length of the floor charge.
• each new spar is expensive, since it involves in particular the development of new tools and multiplies the number of parts to be managed in the factory. It has been proposed in FR 2 956 369 to produce a spar consisting of two parts such as hollow bodies each consisting of an inner and outer profile, extending in the extension of one another by having a covering area and thus allowing adaptation to the length of the silhouette of the vehicle, the recovery area may vary. However, this type of spar is not admissible on long vehicles such as commercial vehicles for which the rear overhang becomes important.
• the present invention aims to overcome the above disadvantages of the prior art.
• the invention provides a rear structural frame of a motor vehicle frame comprising a rectilinear profile, and two lateral flanges integral with the profile, each flange being fixed to a straight section in one or two parts depending the length of said rectilinear profile.
• the flanges are fixed respectively one piece on the profile and thus form a reliable side at one of its ends to a bumper beam of the chassis structure and at its end opposite to a rear crossmember of the chassis structure, the vehicle thus obtained having a cantilever whose length is defined by the length of the flanges.
• each flange is then cut into two parts to fix each of the two parts a flange on the profile, at the ends thereof to form a reliable spar at one of its ends to a bumper beam of the frame structure and at its end opposite a rear axle beam of the chassis structure.
• the same flanges are used, either by being fixed in one part on the section or by being respectively cut into two parts then fixed on the section and this, for lengths of cantilever different vehicle.
• each flange has an end portion that extends beyond one end of the profile and allows attachment to a rear cross member of the frame while an opposite end portion of the flange extends against the opposite end of the frame. profile.
• each flange has a length L0, said flanges mounted in one part on a profile of length L1 forming a side member determining the minimum overhang, the shortest for this type of vehicle.
• the flasks once cut into two parts are fixable to the ends of sections of different lengths L2, L3, etc., greater than L0, forming longitudinal members defining cantilever rear vehicle structure longer than the minimum overhang.
• a spar according to the invention can have different lengths in a simple manner with the same parts by simple cutting operations of the rectilinear profile and flanges.
• a rectilinear section comprises two side walls and a bottom wall connecting the two side walls and the two side plates are secured respectively to the two side walls of the rectilinear profile, the two side flanges comprising two flanges. folded towards each other and a part is supported under the bottom wall of the profile.
• the spar comprises means for its connection to the suspension spring of the vehicle, said means being integral with the two folded edges of the two side flanges.
• the spar thus consists of a part resulting from a profiling and cut to the desired length depending on the vehicle cantilever wanted while each flange is obtained by cutting and bending a plate, by example of steel sheet to form the flanges L0 length corresponding to the shortest cantilever length desired for the vehicle. These flanges are fixed by welding to a profile either in one part or in two parts if necessary.
• the profile has a U-shaped cross section, the side flanges being secured to the legs of the U profile.
• the longitudinal edges of the side walls of the profile comprise outer flanges, and each side flange comprises an outer flange, the outer flanges of the two side flanges being secured respectively under the longitudinal flanges of the side walls of the profile.
• the spar comprises a device for its connection to a bumper beam of the chassis structure, fixing lugs for its connection to a rear cross member of the chassis structure, a device allowing its connection to a tailgating abutment, an attachment piece for its connection to a damper of the vehicle.
• the two side plates have an end portion for overflow in the extension of one end of the profile, and the attachment piece through the protruding portion of the two side plates being secured two side flanges.
• one of the flange portions comprises the projecting end portion and the lower flanges for connecting the means for its connection to the suspension spring of the vehicle.
• the invention also relates to a rear frame structure of a vehicle comprising two side members, characterized in that each side member is as defined above.
• each spar is secured to a rear cross member of the structure by fixing lugs, the other end of each spar being secured to a bumper beam of the structure by a corresponding connection device.
• the structure comprises a reinforcing beam whose ends are integral with the two longitudinal members at each connecting means to the suspension spring of each side member.
• the invention also relates to a vehicle, in particular an automobile, comprising a chassis structure as defined above.
• FIG. 1 is a perspective view of a side member for a first rear frame structure of the vehicle according to the invention
• FIG. 2 is a perspective view of a side member for a second rear vehicle frame structure according to the invention
• - Figure 3 is an exploded perspective view of a spar according to the invention
• FIG. 4 is a perspective view of a rear frame structure provided with a longitudinal member according to FIG. 1;
• FIG. 5 is a perspective view of a side member of the rear frame structure of Figure 4.
• FIG. 6 is a perspective view of a side member according to Figure 2 on the rear frame structure
• FIG. 7 is a cross-sectional view of a longitudinal member along line III-III of FIG. 4. motor vehicles, particularly of the utility type, with reference to FIGS. 1 to 7.
• a longitudinal member 1 comprises a straight section 3 and two side plates 8, 9 integral with the straight section 3.
• Each flange 8, 9 has a length L0 defining with the profile 3 of length L1 as that shown in Figure 1, a shank 1 for a rear frame structure having a short or minimal overhang of the vehicle.
• the profile 3 ' has a length L2 greater than L0 , and also to L1.
• Each flange 8, 9 is then cut into two parts 8a, 8b and 9a, 9b fixed to the ends of the straight section 34 to define with this profile of length L2 greater than L0 and L1 a side member 1 'for a second rear frame structure having a longer vehicle overhang.
• the spar 1 comprises a rectilinear profile 3 whose cross section has a U-shape.
• This profile 3 thus comprises two side walls 4, 5 and a bottom wall 6 connecting the two. side walls 4 and 5.
• the edges of the side walls 4, 5 comprise two external edges 7a and 7b forming a right angle with the side walls 4 and 5 of the profile 3.
• the spar 1 also comprises the two lateral flanges 8 and 9 respectively integral, for example by welding, the side walls 4 and 5 of the profile rectiligne 3.
• the two flanges 8, 9 also comprise two flanges folded towards each other, said lower flanges 11a and 11b, a portion of which 12a, 12b bears under the bottom wall 6 of the rectilinear profile 3, as shown in FIG. 3 and a portion of one 13a is superimposed on the portion 13b of the other securing the two flanges 8, 9.
• Each lateral flange 8, 9 is obtained by folding a plate, for example sheet steel and has a length L0.
• FIG. 4 represents a perspective view of a rear structure portion of this chassis, which comprises two longitudinal members 1 according to the invention, each being connected by its ends on the one hand to the rear axle cross member 18 by means of legs 14, and on the other hand to the bumper beam 17 by a connecting device 15.
• Each rear spar 1 comprises a connecting means 2 of said spar 1 with a suspension spring of the vehicle.
• a cross member 19 reinforces the frame structure in the vicinity of the connection between each side member 1 and a suspension spring, the forces being particularly important at this location.
• the connecting means 2 of a spar to the suspension spring of the vehicle comprises a sheet metal plate 2a secured to the bottom wall of the spar, for example by welding, and a tubular part 2b integral with the plate of sheet 2a, the suspension spring being intended to be arranged around this tubular piece.
• the connecting means 2 of the spar to the suspension spring also comprises a connecting device 2c of the spar to a tailgating abutment (not shown).
• the means 2 allowing the connection of the spar 1 to the suspension spring is secured, for example by welding, the two lower flanges 11a, 11b of the two side flanges 8, 9.
• the spar 1 has a reinforced structure in the vicinity of the connection between the spar 1 and the suspension spring.
• each lateral flange 8, 9 comprises an outer rim said upper flange 10a, 10b, bent at right angles to the body of the side flange.
• the outer flanges 10a, 10b of the two lateral flanges 8, 9 are secured respectively under the two longitudinal flanges 7a, 7b of the side walls 4, 5 of the profile 3, for example by welding.
• the spar comprises flat parts 16 integral, for example by welding, the lower edges 11a, 11b side flanges 8, 9.
• the side flanges are thus connected between they by their lower edges 11a, 11b, over their entire length. In this way, it avoids the spacing of the flanges 8, 9 during the deformation of the side members 1, for example caused by a sudden shock at the rear of the vehicle.
• the spar 1 also comprises a fastening piece 13 for its connection to a damper of the vehicle.
• This attachment piece 13 of tubular shape, is disposed near the rear cross member 18. [0041] So that the attachment piece 13 does not alter the stiffness characteristics of the side member 1, the two side flanges 8, 9 have an end portion which protrudes in the extension of one end of the profile 3: the attachment piece 13 passes only that portion projecting from the two lateral flanges 8, 9 and is integral with said lateral flanges 8, 9
• each spar 1 may have a tubular cross-section, square or rectangular.
• each spar according to the invention can be made by simple rolling and folding operations, using high-grade materials. It is also simpler to manufacture for lower costs by being made from simple definition components such as steel sheets.
• the spar 1 according to the invention which supports the suspension interfaces and resists the rear shocks of the vehicle, is therefore thinner and lighter than a spar of the prior art obtained by stamping, for benefits of equivalent rigidities.
• the lateral flanks 8, 9 have a length L0 so as to extend from one piece all along the section 3 of length L1, with an end portion overflowing said section 3 to allow the establishment of the attachment piece 13.
• the profile 3 to a length L1 is cut a profile 3 'of length L2 greater than the length L1 and at the length L0 of the flanges 8, 9.
• Each side flange 8, 9 is then cut into two parts, one 8a, 9a having the end portion to be in overflow of the profile 3 'to allow it to be connected to the rear crossbeam 18 by fixing lugs 14 and the other part 8b, 9b being positioned at the opposite end of the profile 3 'to allow its attachment to the bumper beam 17 by a connecting device 15.
• the flange end portion 8a, 9a connected to the rear crossmember 18 also comprises the portion of the flanges 8, 9 on which the means 2 allowing the connection of the spar 1 to the suspension spring is secured by example by welding.
• the cutting of the flanges 8, 9 is made along the line AA visible in Figure 1, so that the portion 8a, 9a connected to the rear cross member 18 has the overflow portion and the portion of the flanges 8 , 9 on which is connected the suspension spring and the crosspiece 19.
• the section of the flanges 8, 9 is such that the end portion 8a, 9a substantially corresponds to 2/3 of L0 and the end portion 8b, 9b corresponds to about 1/3 of L0.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Body Structure For Vehicles (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=57838411

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (6)

• 2016
  • 2016-12-20 EP EP16828760.5A patent/EP3558793A1/de not_active Withdrawn
  • 2016-12-20 BR BR112019009669-8A patent/BR112019009669B1/pt active IP Right Grant
  • 2016-12-20 WO PCT/FR2016/053574 patent/WO2018115598A1/fr unknown

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